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I'm also running this board, but I wasn't able to use the built-in chip for updating (also got no docs at all).Anyone has a clue? You can put the STC15L204EA into some special mode by transferring data at powerup, but I didn't find any host tool to talk to the chip.

Also my dealer didn't know, I asked them about what they knew and they didn't even come up with the schematics.